People who study biology are called biologists. Biology looks at how animals and other living things behave and work, and what they are like. Biology also studies how organisms react with each other and the environment. It has existed as a science for about 200 years, and was preceded by natural history. Biology has many research fields and branches. Like all sciences, biology uses the scientific method. This means that biologists must be able to show evidence for their ideas and that other biologists must be able to test the ideas for themselves.

↑"biology, n.". OED Online. 2019. Oxford University Press. http://www.oed.com.research.aadl.org/view/Entry/19228?redirectedFrom=biology (accessed March 23, 2019). Citation: Contrib. Physical & Med. Knowl. Introd. (1799) Chapter 4, "Physiology therefore—or more strictly biology—by which I mean the doctrine of the living system in all its states, appears to be the foundation of ethics and pneumatology."